> The downside of “extensions can do anything!” is that it means extensions can do, well, anything, including things that are hostile to the user’s interests.
This is also arrogant: why do you think it is OK to say I can't do something I want to do because it is possible that I use that freedom to do something that harms my own interests? People fundamentally should be allowed to do things that harm them if blocking them from harm restricts their ability to do things they wanted to do; I mean, you aren't even suggesting some kind of user-controlled sandbox: you are advocating for putting the user themselves in a sandbox because you think they are too stupid to handle power.
This is also arrogant: why do you think it is OK to say I can't do something I want to do because it is possible that I use that freedom to do something that harms my own interests? People fundamentally should be allowed to do things that harm them if blocking them from harm restricts their ability to do things they wanted to do; I mean, you aren't even suggesting some kind of user-controlled sandbox: you are advocating for putting the user themselves in a sandbox because you think they are too stupid to handle power.